Also, you may only auction off a double chest of enchantments or one enchantment.

Which items can be auctioned off?Updated: 11/03/2012Auctions may consist of the following:

Enchanted items in unused condition and in any quantity

Beacon Block

Any item in bulk (Double Chest ONLY with STACKED items in each slot, or 54 unstackable items) For example: 54 Buckets or 54 FULL stacks of Diamonds. You can auction off multiple double chests in one auction as long as they're all full AND the same item.

Which items can be auctioned off?Updated: 11/03/2012Auctions may consist of the following:

Enchanted items in unused condition and in any quantity

Beacon Block

Any item in bulk (Double Chest ONLY with STACKED items in each slot, or 54 unstackable items) For example: 54 Buckets or 54 FULL stacks of Diamonds. You can auction off multiple double chests in one auction as long as they're all full AND the same item.

Unless it was changed recently, I don't think that's the case. I'll check with a mod